/*
 *  Copyright 2001-2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package ar.uba.fi.posgrado.academy.web.action.course;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.collections.CollectionUtils;
import org.apache.log4j.Logger;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import ar.uba.fi.posgrado.academy.model.Course;
import ar.uba.fi.posgrado.academy.model.Resolution;
import ar.uba.fi.posgrado.academy.model.Subject;
import ar.uba.fi.posgrado.academy.service.BodyService;
import ar.uba.fi.posgrado.academy.service.CourseService;
import ar.uba.fi.posgrado.academy.service.SubjectService;
import ar.uba.fi.posgrado.academy.web.form.course.CourseForm;
import ar.uba.fi.posgrado.academy.web.util.CourseTypeToLabelValueTransformer;
import ar.uba.fi.posgrado.common.exception.PosgradoException;

/**
 * Clase que consigue los datos para la pantalla que permite modificar un
 * {@link Course curso}.<br>
 * 
 * @author ariel.piechotka
 */
public class ShowCourseAction extends Action {
	/** Logger */
	private static Logger logger = Logger.getLogger(ShowCourseAction.class);

	private CourseService courseService;

	private SubjectService subjectService;

	private BodyService bodyService;

	public void setCourseService(CourseService courseService) {
		this.courseService = courseService;
	}

	public void setSubjectService(SubjectService subjectService) {
		this.subjectService = subjectService;
	}

	public void setBodyService(BodyService bodyService) {
		this.bodyService = bodyService;
	}

	/**
	 * @see org.apache.struts.action.Action#execute(org.apache.struts.action.ActionMapping,
	 *      org.apache.struts.action.ActionForm,
	 *      javax.servlet.http.HttpServletRequest,
	 *      javax.servlet.http.HttpServletResponse)
	 */
	@SuppressWarnings("unchecked")
	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm actionForm,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		if (logger.isDebugEnabled()) {
			logger.debug("Por mostrar la pantalla de edicion de curso ...");
		}

		Long id = Long.parseLong(request.getParameter("id"));
		Course course = courseService.getById(id);

		CourseForm form = (CourseForm) actionForm;
		form.setId(course.getId());
		form.setCode(course.getCode());
		form.setName(course.getName());
		form.setCurriculum(course.getCurriculum());
		form.setCertificate(course.getCertificate());
		form.setCourseTypeSelected(course.getCourseType().getId().toString());
		form.setIdBody(course.getBody().getId());
		form.setResolutions(course.getResolutions()
				.toArray(new Resolution[] {}));

		List courseTypes = courseService.getAllCourseTypes();
		CollectionUtils.transform(courseTypes,
				new CourseTypeToLabelValueTransformer());
		form.setCourseTypeCollection(courseTypes);

		setSubjects(course, form);
		CourseActionUtils.setBodyOptions(form, bodyService);

		logger.info("Mostrar pantalla editar curso finalizado");
		return mapping.findForward("success");
	}

	private void setSubjects(Course course, CourseForm form)
			throws PosgradoException {
		Set<Subject> actualSubjects = course.getSubjects();

		form.setActualSubjects(new ArrayList<Subject>(actualSubjects));

		Set<Subject> availableSubjects = new HashSet<Subject>(subjectService
				.getAllValid());
		for (Subject subject : actualSubjects)
			availableSubjects.remove(subject);
		form.setAvailableSubjects(new ArrayList<Subject>(availableSubjects));
	}
}
